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Gear Oil Change?

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Old 10-17-2008, 10:11 PM
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gman73
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Default Gear Oil Change?

I had 4.10s installed about 4-5 months ago. Do I need to have the gear oil changed?
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Old 10-18-2008, 11:07 AM
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Argonaut
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Do you NEED to? No. But it can't hurt, the fill plug is magnetic and you will find bits of metal on it and in the bottom of the pumpkin. This happens during break in, so getting them out of there is not a bad idea.
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Old 10-18-2008, 11:23 AM
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157dB
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If the replaced the gear oil with the recommended
Ford Synthetic gear oil, then no, you dont need to change it.
It could be inspected for the proper level, though.
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Old 10-18-2008, 04:54 PM
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gman73
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My installer used Lakewood's BFL gear oil. I don't have any problems with the gears. For 4.10s they are quiet. No whining at all.
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Old 10-18-2008, 05:59 PM
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SCCAGT
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To me, this is a no brainer. There is no filter back there, just a magnet. It wont hold everything. The gears break in, and metal particles circulate. Yes, its a good idea to change out the fluid. I realize so many people have went through cars and never changed the rear diff. The bearings will go bad long before the gears do (providing they were correctly installed). So changing the fluid at least ONCE early on, is just plain good preventative maintenance. Its a whole lot cheaper than going in and doing bearings later on down the road.
3000-5000mi is a good time frame for changing the rear axle oil.
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Old 10-20-2008, 03:11 PM
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ajaibr
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Or you can look at it that Ford doesn't say you need to go change the rear fluid after 5k miles and they deliver the car with new gears also....

If there are enough metal particles collecting in your oil you've got bigger problems than just changing the oil....


Originally Posted by SCCAGT View Post
To me, this is a no brainer. There is no filter back there, just a magnet. It wont hold everything. The gears break in, and metal particles circulate. Yes, its a good idea to change out the fluid. I realize so many people have went through cars and never changed the rear diff. The bearings will go bad long before the gears do (providing they were correctly installed). So changing the fluid at least ONCE early on, is just plain good preventative maintenance. Its a whole lot cheaper than going in and doing bearings later on down the road.
3000-5000mi is a good time frame for changing the rear axle oil.
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Old 10-20-2008, 04:02 PM
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it never hurts to change your fluids... but you should be fine.
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Old 10-20-2008, 04:46 PM
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157dB
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Originally Posted by ajaibr View Post
Or you can look at it that Ford doesn't say you need to go change the rear fluid after 5k miles and they deliver the car with new gears also....

If there are enough metal particles collecting in your oil you've got bigger problems than just changing the oil....

If you have metal particals big enough to cause
bearing damage, you have bigger problems that a
fluid change wont help or wouldnt have helped prevent.

Last edited by 157dB; 10-20-2008 at 04:49 PM.
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Old 10-20-2008, 06:06 PM
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My intention of bringing up bearings, was meant for the long term effects of not changing the gear oil. I see it frequently at my shop. Over time, bearings get pitted and start to rumble. Its nothing more than a good preventative maintenance practice.

Having metal chunks, however, is definetly a sign of larger problems.
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Old 10-20-2008, 06:50 PM
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Preventative maintenance is one thing, 3000 to 5000 miles is just excessive though... Personally I've never even checked the level anywhere short of 50,000 miles....
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